Interleukin 5 (colony-stimulating factor, eosinophil)
(IL-5) is produced by Th2 cells and mast cells after
activation by mitogens or antigens [1]. IL-5 is
capable to induce the survival, growth and differentiation of eosinophils and B-cells
[2].

IL-5 receptor is composed of two polypeptide chains:
alpha and beta subunits. Both subunits contain extracellular domains. The alpha and beta
subunits are associated only in the presence of ligand. Alpha-subunit is ligand-specific
and beta subunit is shared with the receptors for Interleukin 3 (IL-3) and
granulocyte-macrophage colony-stimulating-factor (GM-CSF) [3], [4].

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